Three papers shaping contemporary complex PCI strategy — from guide extension mechanics to calcium modification and imaging-guided retrograde wiring.
Guide Catheter Extension Use Is Associated with Higher Procedural Success in CTO PCI
Catheterization and Cardiovascular Interventions · 2024 · Filho EM, Araujo GN, Machado GP, Padilla L, et al.
In a multicenter CTO registry (LATAM), guide catheter extension (GCE) use was independently associated with higher technical success (OR 2.1, p<0.001). Benefit was most pronounced in antegrade dissection-reentry cases and those requiring deep-seating for active support. MACE rates were comparable regardless of GCE use.
GCE should be considered early — not as a bailout tool. In calcified or tortuous CTOs requiring aggressive guidewire manipulation, upfront telescoping avoids multiple catheter exchanges and preserves backup. The key risk to manage is ostial injury: confirm seating fluoroscopically before every injection.
The American Journal of Cardiology · 2025 · Gomes WF, Zerlotto DS, Viana P, et al.
Meta-analysis of 5 RCTs (n=1,296 CTO PCI). IVI-guided PCI reduced MACE at 1–3 years (7.2% vs 13%; RR 0.55, 95% CI 0.35–0.88; p=0.012), driven primarily by lower TVR (3.1% vs 6.7%; RR 0.52, p=0.038). No significant difference in MI or cardiac death. IVUS subgroup analysis confirmed the MACE benefit.
This is the strongest evidence yet for imaging in CTO PCI. The benefit is in TVR reduction — i.e., better stent optimization at index procedure means fewer re-interventions. In CTOs with long stent segments, IVUS-confirmed MSA and edge dissection assessment are the key metrics. OCT data are sparser but trending the same direction.
JACC: Cardiovascular Interventions · 2021 · Kereiakes DJ, Di Mario C, Riley RF, Shlofmitz RA, Ali ZA, Stone GW, et al.
Patient-level pooled analysis of Disrupt CAD I–IV (n=628, 72 sites, 12 countries). Severe calcification confirmed in 97% of lesions (mean calcium length 41.5 mm). Primary safety (freedom from 30-day MACE, 92.7%) and effectiveness (procedural success 92.4%) endpoints met. 30-day TLF 7.2%, cardiac death 0.5%, stent thrombosis 0.8%. No IVL-associated perforations or no-reflow.
IVL is now a first-line option for severely calcified lesions — not a bailout after rotablation fails. The key advantage is deliverability without wire bias or rotational speed risks. In CTO PCI post-crossing, IVL is particularly useful when calcium is circumferential and balloon-undilatable. Limiting factor: getting the IVL balloon to the lesion, which is where guide extension synergy matters.
Commentary reflects personal clinical perspective and is not a substitute for independent clinical judgment. No industry sponsorship. Paper #01 includes co-authorship by E. Martins Filho.